Today I ran a box off really hot ammo through my CW380. Everything fired and ejected great and the slide locked open on the last shot. I dropped the mag to reload and closed the slide with the slide release. When I went to open the slide again it was locked up. I moved it front to back while working the trigger and it finally released. I field stripped it and checked everything inside. Everything looks normal so I reassembled it. It works fine now. I ran another mag through it and it functions perfectly. What in the world could have caused this?